Function put_aggr_to_proj_analyzer

fn put_aggr_to_proj_analyzer(
    plan: LogicalPlan,
) -> Result<Transformed<LogicalPlan>, DataFusionError>

lift aggr’s composite aggr_expr to outer proj, and leave aggr only with simple direct aggr expr i.e.

proj: avg(x)
-- aggr: [sum(x)/count(x) as avg(x)]

becomes:

proj: sum(x)/count(x) as avg(x)
-- aggr: [sum(x), count(x)]